MAD
MAD is a high-level programming language that emphasizes modularity and extensibility. It is commonly used for developing real-time systems, as well as simulation and data analysis applications.
Hello, world code example:
VECTOR VALUES HELLO = $11HHELLO WORLD*$
PRINT FORMAT HELLO
END OF PROGRAM
Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.